T. Fülöp G. Pokol P. Helander M. Lisak
Magnetosonic-whistler waves may be destabilized by runaway electrons both in fusion and astrophysical plasmas. A linear instability growth rate of these waves in the presence of a runaway avalanche is calculated both perturbatively and by numerical solution of the full dispersion equation. The local threshold of the instability depends on the fract…
PublishedN. J. Conway P. G. Carolan J. Mccone M. J. Walsh M. Wisse
A major upgrade to the charge exchange recombination spectroscopy system on MAST has recently been implemented. The new system consists of a high-throughput spectrometer coupled to a total of 224 spatial channels, including toroidal and poloidal views of both neutral heating beams on MAST. Radial resolution is 1 cm, comparable to the ion Larmor rad…
PublishedM. P. Gryaznevich E. Del Bosco A. Malaquias G. Mank G. Van Oost The IAEA CRP “Joint Research Using Small Tokamaks” Members
A new concept of interactive co-ordinated research using small tokamaks in the mainstream fusion science areas, in testing of new diagnostics, materials and technologies as well as in education, training and broadening of the geography of fusion research in the scope of the IAEA Co-ordinated Research Project (CRP) is discussed in this paper. Beside…
PublishedI. T. Chapman S. E. Sharapov G. T. A. Huysmans A. B. Mikhailovskii
A new code, MISHKA-F Flow, has been developed as an extension of the ideal magnetohydrodynamic MHD code MISHKA-1 [Mikhailovskii and et al. , Plasma Phys. Rep. 23 , 844 (1997)] in order to investigate the linear MHD stability of ideal and resistive eigenmodes with respect to the effects of toroidal rotation in tokamaks in general toroidal geometry w…
PublishedL. C. Ingesson D. J. Campbell M. Cecconello E. Ciattaglia P. Dirken Et Al
The European Union will supply a number of diagnostics for ITER. Significant progress has been made on the design and integration of these diagnostics. Specific topics, in common for several of the diagnostics, discussed are port-plug integration, simplification of labyrinths against neutron streaming, and design measures to protect and to be able …
PublishedG. Van Oost E. Del Bosco M. P. Gryaznevich A. Malaquias G. Mank
Small tokamaks may significantly contribute to the better understanding of phenomena in a wide range of fields such as plasma confinement and energy transport; plasma stability in different magnetic configurations; plasma turbulence and its impact on local and global plasma parameters; processes at the plasma edge and plasma-wall interaction; scena…
PublishedP. Sandquist S. E. Sharapov P. Helander M. Lisak
A corrected relativistic collision operator is used to derive a Fokker-Planck equation for the distribution function of relativistic suprathermal electrons in a weakly relativistic plasma, which is then solved by a procedure similar to that employed in Connor and Hastie [Nucl. Fusion 15 , 415 (1975)]. Analytical expressions are derived for the elec…
PublishedM. Von Hellermann R. Jaspers W. Biel A. Litnovsky O. Neubauer Et Al
A status report is given on recent joint activities on the ITER CXRS and BES diagnostic package. Expected measurement performances are reviewed as well as comprehensive discussions are led on an integral approach to the implementation of Core and Edge CXRS observation periscopes. The “first mirror” location, its operational temperature, mainten…
PublishedM. Manso A. Silva P. Varela D. Borba P. Lang L. Cupido I. Nunes G. Conway The Asdex Upgrade Team.
We present a study performed in ASDEX Upgrade H mode regime based on results from the broadband FM-CW reflectometry diagnostic, equipped with the unique capability of measuring the plasma density profile both at the low and high field sides of the tokamak. The plasma edge dynamics due to fast events such as the Edge Localized Modes (ELMs) is analyz…
Published